This is a note to let you know that I've just added the patch titled
perf test shell arm_coresight: Increase buffer size for Coresight basic tests
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-test-shell-arm_coresight-increase-buffer-size-f.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0536e7f78d1cd83a4e2291059e3fa75c720176eb
Author: James Clark <james.clark@xxxxxxx>
Date: Tue Mar 26 11:37:49 2024 +0000
perf test shell arm_coresight: Increase buffer size for Coresight basic tests
[ Upstream commit 10b6ee3b597b1b1b4dc390aaf9d589664af31df9 ]
These tests record in a mode that includes kernel trace but look for
samples of a userspace process. This makes them sensitive to any kernel
compilation options that increase the amount of time spent in the
kernel. If the trace buffer is completely filled before userspace is
reached then the test will fail. Double the buffer size to fix this.
The other tests in the same file aren't sensitive to this for various
reasons, for example the iterate devices test filters by userspace trace
only. But in order to keep coverage of all the modes, increase the
buffer size rather than filtering by userspace for the basic tests.
Fixes: d1efa4a0a696e487 ("perf cs-etm: Add separate decode paths for timeless and per-thread modes")
Reviewed-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Signed-off-by: James Clark <james.clark@xxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Ian Rogers <irogers@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: James Clark <james.clark@xxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Mike Leach <mike.leach@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Suzuki Poulouse <suzuki.poulose@xxxxxxx>
Link: https://lore.kernel.org/r/20240326113749.257250-1-james.clark@xxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/perf/tests/shell/test_arm_coresight.sh b/tools/perf/tests/shell/test_arm_coresight.sh
index f1bf5621160fb..4d4e685775303 100755
--- a/tools/perf/tests/shell/test_arm_coresight.sh
+++ b/tools/perf/tests/shell/test_arm_coresight.sh
@@ -186,7 +186,7 @@ arm_cs_etm_snapshot_test() {
arm_cs_etm_basic_test() {
echo "Recording trace with '$*'"
- perf record -o ${perfdata} "$@" -- ls > /dev/null 2>&1
+ perf record -o ${perfdata} "$@" -m,8M -- ls > /dev/null 2>&1
perf_script_branch_samples ls &&
perf_report_branch_samples ls &&
